Bottom closure of glassware forming mold



May 24, 1938.

G. E. HOWARD BOTTOM CLOSURE OF GLASSWARE FORMING MOLD Filed Nov. 10. 1936 4 Ill! l l l l P lHl l I- I IHH Illll 1 1 1 Z [a vemZo 2' WiifiSS 6 .9%

fli zoriee Patented May 24, 1938 BOTTOM CLOSURE OF GLASSWARE FORD! ING MOLD George E. Howard, Butler, Pia, assignor to Hartford-Empire Company, Hartford, Conn., a corporation of Delaware Application November 10, 1936, Serial No. 110,108

7 Claims. (Cl. 49-76) This invention relates to bottom closures for glassware forming molds and has particular relation to a closure for a finishing or blow mold adapted to become attached to the bottom of a ll. The members Ila are yieldingly held against the core II by springs It and tend to hold the sleeve ll contracted when core II is retracted therein, as shown in Fig. 1.

66 The bottom ends of members Ila are turned inwardly to provide a flange or reentrant end, as indicated at I5, and which, in conjunction with the bottom of the core, provide a recess or cavity adapted to form a dovetail IE on blank I! when and closing the molds, raising and lowering the neck pin and for operating the plunger and the parts thereof, and for controlling the supply 01' air for blowing the parisons. Such means have not been illustrated or described because they 5 blank glass and to assist in the elongation of pressed into the glass to compact it in the mold. the blank to form a parison as well as to form This provides a mechanical connection oi the the bottom of the finished article. glass with the plunger. The core II has a pas- It has been proposed to employ such a plunger sage ll therein for vacuum which acts on the top to form a blank in a finishing mold and neck of the dovetail to provide additional connection to l0 mold, the plunger being attached to the blank the plunger. after it has pressed the blank in the blank and After a charge is delivered and the plunger neck molds and elevated as air is supplied to the moved downwardly into the mold 5 to press the neck mold to form a hollow elongated parison blank I1 and form the neck flnish.the mold i'is from the blank, and the plunger finally moving cracked, neck pin 1 is lowered and the blank is into position to close the bottom of the mold for developed into a hollow parison by the ele- 15 the final blowing operation. vatlon of the plunger (by means not shown) and The general object of this invention is to prothe admission of air through the neck ring. The vide a plunger oi the above character or novel neck pin maybe lowered to reheat the interior of construction by the use of which secure attachthe neck finish and for the admission of air. Fig.

ment of the glass thereto is assured and other 2 shows plunger I in its uppermost position after advantages obtained. the formation of the parison, and at this time,

More specifically. an object of the invention is the vacuum may be terminated and air admitted to provide a novel plunger which is' adapted to through passage It to separate the dovetail It provide a mechanical attachment or the glass from the bottom of the core II ior reheating, as

thereto, by which a more secure hold on the glass illustrated in Fig. 2. This application or air is Is obtained than if suction alone should be relied so regulated as not to detach the glass from upon for holding the glass by the plunger, the members Ila at this time, but may be sufllcient eilective area upon which suction can be applied to form a small cavity in the end of the blank. being relatively small. To adapt the plunger for use as a bottom other objects and advantages of the invention closure of the mold 5, core II is moved downwill be pointed out in the description which 101- wardly relative to members Ila by suitable means laws, or will become apparent from such de- (not shown). Core II has a shoulder II which scription and the accompanying drawing, in engages complementary shoulders on members 7 which- I Ila and when core II is moved downwardly, the V Figures 1 to 3 inclusive are views in vertical be "a a e cfl d pa t. the ends thereof sectional elevation o1' my novel plunger and a assuming the do t -li P i ns 0! Fig. 4. The blow mold with which it is associated, and 11- bottom end of the core has a similar action on the lustrating respectively various operative posireentrant parts of members Ila. This expands tions of the plunger in the tormation'ot a hollow sleeve ll, freeing the glass from the plunger 40 article, and which may now reheat and permits the end of the 40 Fig. 4 is a view in bottom plan oi said plunger. core to be brought flush with members Ila, as

Referring in detail to the drawing, a finishing shown in Fig. 3, to form Om against which mold Is shown at I, a neck mold at 6 and a neck the parison may be blown into a finished article pin at I. The plunger embodying the invention II- Th par s ar so esi n d ha the spaces Is indicated generally at I. between members ll will not be wide enough to 45 The plunger I comprises an integral guide I for unduly mark the bottom of the finished article. the upper portion of a core II and the lower por- When the blowing operation is completed, the tion a: this core is surrounded by an expanslble parts oi the plunger are restored to their original sleeve Il formed of segmental members Ila. pivpositions, as shown in Fig. l.

oted for radial movement on guide I, as'shown at Suitable means may be provided for opening 50 can readily be supplied by one skilled in the art and illustration and description thereof are unnecessary for an understanding of the invention.

Having thus described my invention, what I claim is:

l. A plunger for pressing and elongating a glass blank, the glass engaging end of which comprises a core and an expansible sleeve slidably receiving said core and so constructed and arranged that when the core is retracted in the sleeve and the sleeve is contracted a glass-receiving cavity is provided for attaching the plunger to the glass blank and when the core is projected outwardly of the sleeve and the sleeve is expanded the plunger is detached from the glass.

2. A plunger tor pressing and elongating a glass blank, the glass contacting end of which comprises a core and an expansible sleeve slidably receiving said core, said sleeve comprising a plurality of segmental members shaped to form with the end 01' the core a glass-receiving cavity for the attachment of the plunger to said glass blank, and to release the glass when .the sleeve is expanded.

3. A plunger for elongating a glass blank and for pressing and shaping the bottom of a finished article, the glass engaging end of which comprises a core, and an expansible sleeve slidably receiving said core and formed into a plurality of segments, said sleeve being shaped to provide a glass-receiving cavity for attaching the plunger to said blank when the core is retracted therein and the sleeve is contracted, and to release the glass and form with the core a bottom shaping surface when the sleeve is expanded and the core is projected outwardly thereof.

Patent No. 2,1 8,793- 1 GEORGE E. HOWARD.

4. A plunger for pressing and elongating a glass blank, the glass engaging end of which comprises a core and an expansible sleeve forming with the core, when the core is retracted and the sleeve contracted, a glass-receiving cavity in the end of said plunger having a reentrant edge.

5. A plunger for pressing and elongating a glass blank, the glass engaging end of which comprises a core and an expansible sleeve forming with the core, a glass-receiving cavity in the end of said plunger, and said core having a passage'therein for applying suction to said cavity.

6. A plunger for pressing and elongating a. glass blank, the glass-engaging end of which comprises an expansible sleeve, and a core slidable in said sleeve so constructed and arranged that retractlon of the core within the sleeve causes contraction of the sleeve and the formation of a cavity adapted to connect the plunger with the glass, and when the core is projected outwardly of the sleeve, the sleeve is expanded and the plunger is disconnected from the glass.

- 7. In combination with a body mold, neck mold and neck pin, a plunger adapted to be inserted through the bottom of the body mold to press a, charge of glass in the mold and to elongate the glass, said plunger comprising an expansible sleeve and a core slidable therein, which core when retracted and said sleeve providing a cavity whereby said pressing operation connects the plunger with the glass, whereby the glass may be elongated by said plunger, and said core being adapted to disconnect the glass from the plunger when projected outwardly of said sleeve,

GEORGE E. HOWARD.

' CERTIFICATE OF CORRECTI ON.-

May 21 1958.

It ishereby certified that .error appearsdn the printed specification of the above numbered patent requiring correction as follows: Page 2, first column, line 26, elaim5, strike out ;the Words "pressing uni" and insert the same after-"for" in line 25, same claim; ,and that the said Letters .Patent should he readwith thiscorrection therein that the same may conform to the record of the case in'th e Patent Office. I

si ned and sealed this 19th deyof July, A. D. 19 8.

' 'Henry Va n Arsdaie Acting Commie si'oner 'of- Patents can readily be supplied by one skilled in the art and illustration and description thereof are unnecessary for an understanding of the invention.

Having thus described my invention, what I claim is:

l. A plunger for pressing and elongating a glass blank, the glass engaging end of which comprises a core and an expansible sleeve slidably receiving said core and so constructed and arranged that when the core is retracted in the sleeve and the sleeve is contracted a glass-receiving cavity is provided for attaching the plunger to the glass blank and when the core is projected outwardly of the sleeve and the sleeve is expanded the plunger is detached from the glass.

2. A plunger tor pressing and elongating a glass blank, the glass contacting end of which comprises a core and an expansible sleeve slidably receiving said core, said sleeve comprising a plurality of segmental members shaped to form with the end 01' the core a glass-receiving cavity for the attachment of the plunger to said glass blank, and to release the glass when .the sleeve is expanded.

3. A plunger for elongating a glass blank and for pressing and shaping the bottom of a finished article, the glass engaging end of which comprises a core, and an expansible sleeve slidably receiving said core and formed into a plurality of segments, said sleeve being shaped to provide a glass-receiving cavity for attaching the plunger to said blank when the core is retracted therein and the sleeve is contracted, and to release the glass and form with the core a bottom shaping surface when the sleeve is expanded and the core is projected outwardly thereof.

Patent No. 2,1 8,793- 1 GEORGE E. HOWARD.

4. A plunger for pressing and elongating a glass blank, the glass engaging end of which comprises a core and an expansible sleeve forming with the core, when the core is retracted and the sleeve contracted, a glass-receiving cavity in the end of said plunger having a reentrant edge.

5. A plunger for pressing and elongating a glass blank, the glass engaging end of which comprises a core and an expansible sleeve forming with the core, a glass-receiving cavity in the end of said plunger, and said core having a passage'therein for applying suction to said cavity.

6. A plunger for pressing and elongating a. glass blank, the glass-engaging end of which comprises an expansible sleeve, and a core slidable in said sleeve so constructed and arranged that retractlon of the core within the sleeve causes contraction of the sleeve and the formation of a cavity adapted to connect the plunger with the glass, and when the core is projected outwardly of the sleeve, the sleeve is expanded and the plunger is disconnected from the glass.

- 7. In combination with a body mold, neck mold and neck pin, a plunger adapted to be inserted through the bottom of the body mold to press a, charge of glass in the mold and to elongate the glass, said plunger comprising an expansible sleeve and a core slidable therein, which core when retracted and said sleeve providing a cavity whereby said pressing operation connects the plunger with the glass, whereby the glass may be elongated by said plunger, and said core being adapted to disconnect the glass from the plunger when projected outwardly of said sleeve,

GEORGE E. HOWARD.

' CERTIFICATE OF CORRECTI ON.-

May 21 1958.

It ishereby certified that .error appearsdn the printed specification of the above numbered patent requiring correction as follows: Page 2, first column, line 26, elaim5, strike out ;the Words "pressing uni" and insert the same after-"for" in line 25, same claim; ,and that the said Letters .Patent should he readwith thiscorrection therein that the same may conform to the record of the case in'th e Patent Office. I

si ned and sealed this 19th deyof July, A. D. 19 8.

' 'Henry Va n Arsdaie Acting Commie si'oner 'of- Patents 

